What is the name of the secret society founded by Bayek and Aya in Assassin's Creed Origins?

Bayek and Aya found the Hidden Ones in Assassin's Creed Origins.

The organization forms after Bayek and Aya confront the consequences of the Order of Ancients' influence in Egypt. Its members operate covertly and defend ordinary people from oppressive rulers and powerful conspirators. The Hidden Ones use methods and principles that later develop into the Assassin Brotherhood.

Origins is set centuries before the events of the first Assassin's Creed. Because of that early setting, the group is not yet called the Assassins. The game uses the Hidden Ones as the historical beginning of the tradition rather than presenting the later organization as already fully established.

The Order of Ancients is the rival organization in Origins and is the precursor to the Templar Order. The Levantine Brotherhood is associated with the later medieval Assassin organization, so it is a related but different name.